There is detailed explanation in http://communities.vmware.com/message/2095681#2095681 thread. You can easily try this by running the following command
# lvm lvs -o lv_name,vg_name,lv_size,lv_attr,stripes --units b --noheadings --unbuffered --separator \| VolGroup
on the source machine and look at the output in the fourth column. If there are 6 columns - then it is the old LVM. If there are 8 columns - it is the new (unsupported) one.